Copper C706 (Nickel Silver)
Introduction to Copper C706 (Nickel Silver)
Copper C706, commonly known as Nickel Silver, is a copper alloy primarily composed of copper, nickel, and zinc. Although this alloy contains no silver, it earns its name from its silver-like appearance and exceptional properties. Copper C706 offers excellent corrosion resistance, strength, and durability, making it a popular choice in demanding applications where both appearance and performance are critical. It is widely used in CNC machining services for high-performance components, particularly in electronics, automotive, and marine industries.
Copper C706's unique combination of properties makes it ideal for creating precision-engineered parts in mechanical, electrical, and decorative applications. CNC machined Copper C706 parts are used to develop components such as electrical connectors, marine fittings, and automotive parts that require high strength and resistance to corrosion.
Chemical, Physical, and Mechanical Properties of Copper C706 (Nickel Silver)
Chemical Composition (Typical)
Element | Composition Range (wt.%) | Key Role |
|---|---|---|
Copper (Cu) | 55.0–65.0% | Provides strength and corrosion resistance |
Nickel (Ni) | 10.0–20.0% | Enhances strength, wear resistance, and corrosion resistance |
Zinc (Zn) | 20.0–30.0% | Increases strength and hardness |
Physical Properties
Property | Value (Typical) | Test Standard/Condition |
|---|---|---|
Density | 8.5–8.9 g/cm³ | ASTM B311 |
Melting Point | 1,050°C | ASTM E29 |
Thermal Conductivity | 120 W/m·K at 20°C | ASTM E1952 |
Electrical Conductivity | 15–20% IACS at 20°C | ASTM B193 |
Coefficient of Expansion | 17 µm/m·°C | ASTM E228 |
Specific Heat Capacity | 380 J/kg·K | ASTM E1269 |
Elastic Modulus | 105 GPa | ASTM E111 |
Mechanical Properties (Annealed Temper)
Property | Value (Typical) | Test Standard |
|---|---|---|
Tensile Strength | 400–650 MPa | ASTM E8/E8M |
Yield Strength (0.2%) | 300–450 MPa | ASTM E8/E8M |
Elongation | 15–25% | ASTM E8/E8M |
Hardness | 100–130 HB | ASTM E10 |
Fatigue Strength | ~200 MPa | ASTM E466 |
Impact Resistance | Good | ASTM E23 |
Note: These values are typical for annealed Copper C706 and can vary based on specific processing conditions.
Key Characteristics of Copper C706 (Nickel Silver)
Excellent Corrosion Resistance
Copper C706 has superior corrosion resistance, especially in harsh environments like marine and industrial applications, making it ideal for long-term use in corrosive conditions.
High Strength and Toughness
Compared to pure copper, Copper C706 offers higher strength and toughness, making it suitable for high-stress applications such as gears, bushings, and connectors.
Good Wear Resistance
The nickel content in Copper C706 provides excellent wear resistance, particularly in applications subjected to frequent friction and mechanical stress.
Aesthetic Appearance
Copper C706 has a bright, silver-like appearance, making it an attractive choice for decorative applications such as jewelry, trim, and musical instruments.
Excellent Formability
Copper C706 can be easily formed and fabricated, making it ideal for CNC machining processes requiring precision and complex shapes.
CNC Machining Challenges and Solutions for Copper C706 (Nickel Silver)
Machining Challenges
High Strength
Copper C706’s high strength can increase the difficulty of machining, leading to tool wear and decreased machining efficiency.
Solution: Use carbide or coated carbide tools, reduce cutting speeds, and ensure proper cooling to minimize tool wear and maintain efficient cutting.
Tool Wear
Copper C706’s hardness and toughness can cause significant tool wear, especially in high-speed operations.
Solution: Use high-performance carbide tools with appropriate coatings and regularly inspect and replace tools to extend tool life.
Chip Formation
Copper C706 can produce stringy, long chips that may interfere with machining.
Solution: Use chip breakers to control chip formation, adjust feed rates, and ensure proper coolant usage to facilitate smooth chip removal.
Work Hardening
Copper C706 may work-harden if not properly machined, making further operations more difficult.
Solution: Use lower cutting speeds, maintain sharp cutting edges, and apply cooling techniques to prevent work hardening during machining.
Optimized Machining Strategies
Tool Selection
Parameter | Recommendation | Rationale |
|---|---|---|
Tool Material | Carbide or ceramic tools | Carbide tools provide better wear resistance |
Geometry | Positive rake, sharp edges | Enhances chip flow and reduces material buildup |
Cutting Speed | 150–250 m/min | Reduces excessive heating and extends tool life |
Feed Rate | 0.10–0.20 mm/rev | Ensures smooth cutting and prevents material deformation |
Coolant | High-pressure coolant or air blast | Prevents heat buildup and improves surface finish |
Copper C706 Cutting Parameters (ISO 513 Compliance)
Operation | Speed (m/min) | Feed (mm/rev) | Depth of Cut (mm) | Coolant Pressure (bar) |
|---|---|---|---|---|
Roughing | 150–200 | 0.15–0.25 | 2.0–3.5 | 30–40 |
Finishing | 200–250 | 0.05–0.10 | 0.5–1.0 | 35–50 |
Typical Machining Methods for Copper C706 (Nickel Silver)
Machining Process | Function and Benefit for Copper C706 (Nickel Silver) |
|---|---|
Provides precise machining of connectors, bushings, and gears with excellent strength and corrosion resistance. | |
Ideal for creating slots and grooves for connectors and fittings in harsh environments. | |
Suitable for turning cylindrical components such as valves and mechanical parts. | |
Used for drilling high-precision holes for fasteners and connectors. | |
Ensures precise internal machining for mechanical parts like bushings. | |
Provides smooth finishes for components exposed to friction, like gears and bushings. | |
Ideal for creating complex shapes and multi-featured parts for aerospace and industrial use. | |
Delivers ultra-tight tolerances for demanding components used in mechanical and electrical applications. | |
Perfect for intricate features in aerospace and automotive components. |
Surface Treatment for Copper C706 CNC Parts
Electroplating: Adds a nickel or gold coating for enhanced corrosion resistance, ideal for electrical connectors and fittings.
Polishing: Achieves smooth, glossy finishes that improve both electrical conductivity and visual appeal.
Brushing: Ideal for creating a satin finish that improves both appearance and corrosion resistance in industrial parts.
PVD Coating: Adds a durable coating for improved wear resistance, perfect for high-friction and load-bearing parts.
Passivation: Enhances the alloy's natural corrosion resistance, making it more suitable for marine and outdoor applications.
Powder Coating: A thick, protective coating resists UV damage and chemical exposure.
Teflon Coating: Adds a low friction, chemical-resistant layer ideal for components exposed to harsh chemicals.
Chrome Plating: Adds a durable and shiny finish, offering superior corrosion protection for industrial and decorative applications.
Industry Applications of Copper C706 (Nickel Silver)
Aerospace Industry: Used in components like connectors, bushings, and heat exchangers that require both strength and corrosion resistance.
Electrical & Power: Ideal for producing connectors, terminals, and busbars in electrical systems.
Automotive Industry: Suitable for creating electrical connectors and parts exposed to high mechanical and thermal stress.
FAQs
What makes Copper C706 ideal for marine and aerospace applications?
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What industries use Copper C706 for high-strength and corrosion-resistant applications?
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